3B-O-(4-O-Acetyl-2,6-dideoxy-3-C-methyl-alpha-L-arabino-hexopyranosyl)-7-methylolivomycin D
[A glycosidic antineoplastic antibiotic isolated from the bacterium Streptomyces griseus. Chromomycin A3 reversibly binds to guanine-cytosine (G-C) base pairs in the minor groove of DNA, thereby inhibiting RNA synthesis. This agent is used as a fluorescent chromosome dye. (NCI04) ( NCI )]